Adding codecs to the RtpParameters returned by an RtpSender.

webrtc/api/objc/RTCRtpParameters.mm

 /*
  *  Copyright 2016 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
 #import "RTCRtpParameters+Private.h"
+
+#import "RTCRtpCodecParameters+Private.h"
 #import "RTCRtpEncodingParameters+Private.h"
 
 @implementation RTCRtpParameters
 
 @synthesize encodings = _encodings;
+@synthesize codecs = _codecs;
 
 - (instancetype)init {
   return [super init];
 }
 
 - (instancetype)initWithNativeParameters:
     (const webrtc::RtpParameters &)nativeParameters {
   if (self = [self init]) {
     NSMutableArray *encodings = [[NSMutableArray alloc] init];
     for (const auto &encoding : nativeParameters.encodings) {
       [encodings addObject:[[RTCRtpEncodingParameters alloc]
                                initWithNativeParameters:encoding]];
     }
     _encodings = encodings;
+
+    NSMutableArray *codecs = [[NSMutableArray alloc] init];
+    for (const auto &codec : nativeParameters.codecs) {
+      [codecs addObject:[[RTCRtpCodecParameters alloc]
+                            initWithNativeParameters:codec]];
+    }
+    _codecs = codecs;
   }
   return self;
 }
 
 - (webrtc::RtpParameters)nativeParameters {
     webrtc::RtpParameters parameters;
   for (RTCRtpEncodingParameters *encoding in _encodings) {
     parameters.encodings.push_back(encoding.nativeParameters);
   }
+  for (RTCRtpCodecParameters *codec in _codecs) {
+    parameters.codecs.push_back(codec.nativeParameters);
+  }
   return parameters;
 }
 
 @end